There are a lot of answers on Worldbuilding about how to destroy planets - just as an example - and they seem to be the method of choice for many people intent on destroying the world. My objection to ...

The setting: Very distant future, Earth is long gone/forgotten/just not around anymore. Humanity, whatever it may consist of (people, AI, something in-between) inhabits a single vast generation ship ...

The Sun has nowhere near enough mass to enter the branch of stellar evolution that would lead to a supernova, fortunately for us. However, there are planets that orbit stars that are destined to go ...

In my previous question, I asked how much mass the Sun would have to lose in order for Saturn's orbital velocity to be its escape velocity.
The answer proved to be somewhat unexpected - when the Sun ...

By "biological brain in a box" AKA Brain in a vat I mean a robot which holds a physiologically normal human brain, and produces identical input / output as would be produced by a healthy human body (...

Assuming in a galaxy far far away there is a Type 2 civilization (currently on the verge of making the transition to Type 3).
Their scientists predicted that the star (red giant) they are orbiting is ...

Very soon I suspect we will see the rise of machine in the next couple of decades if people continue abusing Moore laws, suppose robot laws are hardwired into their core how can we make them believe ...

As far as I know stars are going supernova as a natural process. Can aliens trigger it artificially?
If this is possible then:
How can I do this (what minimum technology and civilization development ...

Assuming some magic handwavium caused the sun to go supernova, how long would it take to reach Earth and wipe out the planet? I know it would be eight minutes until the light reached us, but how fast ...

On earth where we puny humans fight each other on land air and sea we have of a concept of strategic points which are
oil fields
trade choke points
islands in the sea
mountains on land
places where ...

My question is about a far off and seclusive colony in the reaches of the Orion nebula. As they are relatively isolated they have resorted to harvesting the nebula itself for resources.
What I want ...

As a high mass star which have already burnt through all of the lighter elements and is now building up iron, the fusion reaction will no longer produce sufficient energy to counter its own weight. In ...